The most famous hippodrome of the past is the Circus Maximus in Rome. Augustus in 10bc brought an obelisk from Egypt to decorate the ‘spina’.
The obelisks were considered, by both Egyptian and Romans, to represent the connection between the sky and the earth.
The hippodrome was a little model of the cosmos:
The obelisk was the sun, the ground represented the earth and the canal running in the middle of the spina was the sea.
The four factions of chariot raiders represented the 4 seasons.